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pericyclic reaction
相关语句
  周环反应
    Substituent Effect on Pericyclic Reaction of 2-Methyl Cyclobuten-2-ol
    2-甲基-环丁-2-烯醇周环反应中的取代基效应
短句来源
    The Rules of Symmetry of Molecular O rbitals and Pericyclic Reaction
    分子轨道对称性规律与周环反应
短句来源
    A CONVENIENT METHOD WITH FRONTAL ORBIT THEORY TO PREDICT THE LAW OF PERICYCLIC REACTION
    用前线轨道理论判断周环反应规律的简单方法
短句来源
    Stereoselectivities of Pericyclic Reaction Determined by Perturbation Theory
    微扰法确定周环反应的立体选择性
短句来源
    A New Simple Selective Rule for Pericyclic Reaction
    一种简便的周环反应通用选择规则
短句来源
更多       
  “pericyclic reaction”译为未确定词的双语例句
    The Correlation Diagram of Nonsymmetric Pericyclic Reaction
    非对称周环反应的能量相关
短句来源
    This method can be con veniently used to resolve the problems in pericyclic reaction.
    用此方法,可以方便地解决轮烯、多环芳烃等的周环反应的周边选择问题。
短句来源
    Recent progress in the synthesisof C60 derivatives is reviewed according to the mechanism of organic chemical reaction, such as addition,oxidation-reduction, ionic reaction, pericyclic reaction, radical reaction, and so on.
    从有机反应的角度,概述了C60衍生物合成中的几个主要反应类型。
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  pericyclic reaction
A simple procedure for determining whether a pericyclic reaction is thermally allowed is described.
      
The Claisen rearrangement of ally1 enol ethers is another pericyclic reaction of great importance in organic synthesis.
      
One possible reaction is the surface pericyclic reaction that is discussed below.
      


The important pericyclic reactions and Woodward-Hoffmann rules are presented by these lecture notes. The major viewpoints related to the rules of pericyclic reactions, such as the conservation of orbital symmetry, the frontier orbital approach and the conception of "aromatic transition state", are all discussed in some detail. The recent progress of conceretd reactions, for instance as the quantitative and semi-quantitative treatment of the activity as well as regioselectivity, is also surveyed...

The important pericyclic reactions and Woodward-Hoffmann rules are presented by these lecture notes. The major viewpoints related to the rules of pericyclic reactions, such as the conservation of orbital symmetry, the frontier orbital approach and the conception of "aromatic transition state", are all discussed in some detail. The recent progress of conceretd reactions, for instance as the quantitative and semi-quantitative treatment of the activity as well as regioselectivity, is also surveyed in the present lecture notes.

本讲义介绍了重要的周环反应和伍德沃—霍犬曼规则。有关周环反应的主要观点,如规道对称守恒,前线轨道方法和“芳香过渡态”概念都有所探讨。协同反应的最新进展,例如活性及区域选择性的定量及半定量处理,本讲义也进行了探讨。

Improvements on Tang's HMO model for pericyclic reactions are introducedin order to calculate activation energies.The most important modification is tomake the model reflect the changes of the planarity of the intermediate state.For 37 reactions including electrocyclic reactions involving four-,six-,andeight-membered ring,Diels-Alder reactions,and Cope rearrangement,the root-mean-square error of the calculated activation energies vs.the experimental onesis 5.1 kcal.Qualitive feature in...

Improvements on Tang's HMO model for pericyclic reactions are introducedin order to calculate activation energies.The most important modification is tomake the model reflect the changes of the planarity of the intermediate state.For 37 reactions including electrocyclic reactions involving four-,six-,andeight-membered ring,Diels-Alder reactions,and Cope rearrangement,the root-mean-square error of the calculated activation energies vs.the experimental onesis 5.1 kcal.Qualitive feature in some series is reproduced fairly well by thecalculation.

对唐敖庆关于周环反应的HMO模型引入了一些改进以用于计算活化能.改进的关键在于使模型反映中间态平面性的变化.对于37个反应,包括牵涉到四元、六元和八元环的电环反应、Diels-Alder反应以及Cope重排,计算值相对于实验值的根均方误差为5.1千卡.一些系列的定性规律在计算中得到良好的重现.

Generalized pericyclic reactions are treated as concerted intra-and intermocecular cycloadditions . Established thereby is the corresponding secular determinant which on expansion by Laplacian theorem and mathematical induction gives the following secular polynomials;

应用Laplace定理和数学归纳法展开一般化周环反应过渡状态的久期行列式,进而阐明周环反应的选择规律与环状过渡状态的拓扑性质及电子条件间的联系。最后,从周环反应要求过渡状态具有芳香性出发,导出了Woodward与Hoffmann提出的一般规律。

 
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